279 lines
7.4 KiB
Python
279 lines
7.4 KiB
Python
# Copyright 2011 Corentin Chary <corentin.chary@gmail.com>
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# Copyright 2020-2023 src_prepare group
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# Distributed under the terms of the GNU General Public License v2
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import difflib
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import io
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import re
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import urllib.error
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import urllib.parse
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import urllib.request
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import warnings
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from urllib.parse import urljoin, urlparse
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import portage
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from bs4 import BeautifulSoup, XMLParsedAsHTMLWarning
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from euscan import (
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BRUTEFORCE_BLACKLIST_PACKAGES,
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BRUTEFORCE_BLACKLIST_URLS,
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CONFIG,
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SCANDIR_BLACKLIST_URLS,
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helpers,
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mangling,
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output,
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)
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HANDLER_NAME = "generic"
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CONFIDENCE = 45
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PRIORITY = 0
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BRUTEFORCE_HANDLER_NAME = "brute_force"
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BRUTEFORCE_CONFIDENCE = 30
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def confidence_score(found, original, minimum=CONFIDENCE):
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found_p = urlparse(found)
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original_p = urlparse(original)
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# check if the base url is the same
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if found_p.netloc != original_p.netloc:
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return minimum
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# check if the directory depth is the same
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if len(found_p.path.split("/")) != len(original_p.path.split("/")):
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return minimum
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# strip numbers
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found_path = re.sub(r"[\d+\.]?", "", found_p.path)
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original_path = re.sub(r"[\d+\.]?", "", original_p.path)
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# strip the first equal part of the path
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i = 0
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max_i = len(found_path)
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while i < max_i and found_path[i] == original_path[i]:
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i += 1
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found_path = found_path[i:]
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original_path = original_path[i:]
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# calculate difference ratio
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diff = difflib.SequenceMatcher(None, found_path, original_path).ratio()
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return int(minimum + minimum * diff) # maximum score is minimum * 2
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def scan_html(data, url, pattern):
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warnings.filterwarnings("ignore", category=XMLParsedAsHTMLWarning)
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soup = BeautifulSoup(data, features="lxml")
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results = []
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for link in soup.findAll("a"):
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href = link.get("href")
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if not href:
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continue
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if href.startswith(url):
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href = href.replace(url, "", 1)
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match = re.search(pattern, href, re.I)
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if match:
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results.append(
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(".".join([x for x in match.groups() if x is not None]), match.group(0))
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)
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return results
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def scan_ftp(data, url, pattern):
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buf = io.StringIO(data)
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results = []
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for line in buf.readlines():
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line = line.replace("\n", "").replace("\r", "")
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match = re.search(pattern, line, re.I)
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if match:
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results.append(
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(".".join([x for x in match.groups() if x is not None]), match.group(0))
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)
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return results
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def scan_directory_recursive(cp, ver, rev, url, steps, orig_url, options):
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if not steps:
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return []
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url += steps[0][0]
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pattern = steps[0][1]
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steps = steps[1:]
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output.einfo("Scanning: %s" % url)
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try:
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fp = helpers.urlopen(url)
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except urllib.error.URLError:
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return []
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except IOError:
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return []
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if not fp:
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return []
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data = fp.read()
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results = []
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if re.search(b"<\s*a\s+[^>]*href", data, re.I):
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results.extend(scan_html(data, url, pattern))
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elif url.startswith("ftp://"):
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results.extend(scan_ftp(data, url, pattern))
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versions = []
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for up_pv, path in results:
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pv = mangling.mangle_version(up_pv, options)
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if helpers.version_filtered(cp, ver, pv):
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continue
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if not url.endswith("/"):
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url = url + "/"
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path = urljoin(url, path)
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if not steps and path not in orig_url:
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confidence = confidence_score(path, orig_url)
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path = mangling.mangle_url(path, options)
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versions.append((path, pv, HANDLER_NAME, confidence))
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if steps:
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ret = scan_directory_recursive(cp, ver, rev, path, steps, orig_url, options)
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versions.extend(ret)
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return versions
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def scan_url(pkg, url, options):
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if CONFIG["scan-dir"]:
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for bu in SCANDIR_BLACKLIST_URLS:
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if re.match(bu, url):
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output.einfo("%s is blacklisted by rule %s" % (url, bu))
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return []
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resolved_url = helpers.parse_mirror(url)
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if not resolved_url:
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return []
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cp, ver, rev = portage.pkgsplit(pkg.cpv)
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# 'Hack' for _beta/_rc versions where _ is used instead of -
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if ver not in resolved_url:
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newver = helpers.version_change_end_sep(ver)
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if newver and newver in resolved_url:
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output.einfo("Version: using %s instead of %s" % (newver, ver))
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ver = newver
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template = helpers.template_from_url(resolved_url, ver)
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if "${" not in template:
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output.einfo(
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"Url doesn't seems to depend on version: %s not found in %s"
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% (ver, resolved_url)
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)
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return []
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else:
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output.einfo("Scanning: %s" % template)
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steps = helpers.generate_scan_paths(template)
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ret = scan_directory_recursive(cp, ver, rev, "", steps, url, options)
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if not ret:
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ret = brute_force(pkg, url)
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return ret
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def brute_force(pkg, url):
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if CONFIG["brute-force"] == 0:
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return []
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cp, ver, rev = portage.pkgsplit(pkg.cpv)
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url = helpers.parse_mirror(url)
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if not url:
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return []
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for bp in BRUTEFORCE_BLACKLIST_PACKAGES:
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if re.match(bp, cp):
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output.einfo("%s is blacklisted by rule %s" % (cp, bp))
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return []
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for bp in BRUTEFORCE_BLACKLIST_URLS:
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if re.match(bp, url):
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output.einfo("%s is blacklisted by rule %s" % (cp, bp))
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return []
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output.einfo("Generating version from " + ver)
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components = helpers.split_version(ver)
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versions = helpers.gen_versions(components, CONFIG["brute-force"])
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# Remove unwanted versions
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for v in versions:
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if helpers.vercmp(cp, ver, helpers.join_version(v)) >= 0:
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versions.remove(v)
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if not versions:
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output.einfo("Can't generate new versions from " + ver)
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return []
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template = helpers.template_from_url(url, ver)
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if "${PV}" not in template:
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output.einfo(
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"Url doesn't seems to depend on full version: %s not found in %s"
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% (ver, url)
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)
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return []
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else:
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output.einfo("Brute forcing: %s" % template)
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result = []
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i = 0
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done = []
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while i < len(versions):
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components = versions[i]
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i += 1
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if components in done:
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continue
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done.append(tuple(components))
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version = helpers.join_version(components)
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if helpers.version_filtered(cp, ver, version):
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continue
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try_url = helpers.url_from_template(template, version)
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infos = helpers.tryurl(try_url, template)
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if not infos:
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continue
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confidence = confidence_score(try_url, url, minimum=BRUTEFORCE_CONFIDENCE)
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result.append([try_url, version, BRUTEFORCE_HANDLER_NAME, confidence])
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if len(result) > CONFIG["brute-force-false-watermark"]:
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output.einfo("Broken server detected ! Skipping brute force.")
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return []
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if CONFIG["brute-force-recursive"]:
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for v in helpers.gen_versions(list(components), CONFIG["brute-force"]):
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if v not in versions and tuple(v) not in done:
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versions.append(v)
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if CONFIG["oneshot"]:
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break
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return result
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def can_handle(pkg, url):
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return True
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